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Finding the Third Proportional to 15,726 and 21,369

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Solution

The third proportional to 15,726 and 21,369 is: 29,036.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,726 : 21,369 = 21,369 : x
  2. Step 2: Convert to fraction form
    15,726/21,369 = 21,369/x
  3. Step 3: Cross multiply
    15,726x = 21,369 × 21,369
  4. Step 4: Simplify right side
    15,726x = 456,634,161
  5. Step 5: Solve for x
    x = 456,634,161/15,726
  6. Step 6: Final answer
    x = 29,036.89

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.